Catálogo de publicaciones - revistas

<jats:p> Stephen Hawking is betting his shirt again. Earlier this year, the Cambridge University astrophysicist conceded one wager about the hypothetical ruptures in the laws of nature called singularities. But this time, according to a new theorem to be published in the <jats:italic>Annals of Mathematics</jats:italic> , Hawking has a better chance of winning. </jats:p>

<jats:p> The collision of continents, which results in mountain formation, takes place through subduction, in which one slab of crust is pushed below another. The rock that is subducted is put under high pressure and new mineral phases can form. As discussed in the Perspective by Liou <jats:italic>et al.</jats:italic> , a report by Darling <jats:italic>et al.</jats:italic> in the same issue ( <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="91" related-article-type="in-this-issue" vol="276" xlink:href="10.1126/science.276.5309.91" xlink:type="simple">p. 91</jats:related-article> ) describes a low-pressure mineral--cristobalite--that was found in high-pressure rocks. Understanding how this low-pressure form of silicate was created and preserved may lead to better understanding of the process of subduction and how deep material is brought to the surface. </jats:p>

<jats:p> During recombination, strands of DNA break and are rejoined, producing the reshuffling of genetic information that underlies genetic diversity. Jayaram discusses the chemical mechanism underlying this process, including the controversial cis-trans paradox, as revealed by the x-ray crystallographic structure of the recombinase lambda integrase, reported in this issue by Kwon <jats:italic>et al.</jats:italic> ( <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="126" related-article-type="in-this-issue" vol="276" xlink:href="10.1126/science.276.5309.126" xlink:type="simple">p. 126</jats:related-article> ). </jats:p>

<jats:p>Last year, the second of the two receptors that HIV uses to enter and infect human cells was identified. In his Perspective, Moore discusses the resulting revolution in thought about how these coreceptor molecules can influence the progress of AIDS and what their existence means for future therapies.</jats:p>